[Gate-users] To set an energy threshold limit lower than 250 eV

[David Sarrut]

Hello,

by "range cut" (it is probably not the right word), I mean: stopping the
particle when its energy is below a threshold.

by "production cut"  (G4 wording), do not create new track if energy (or
range) is below a threshold.

In Gate :

# "Conventional cut" in range
/gate/physics/SetMinRemainingRangeInRegion myRegion 0.1 mm
/gate/physics/ActivateSpecialCuts e-

# "Conventional cut" in energy
/gate/physics//SetMinKineticEnergyInRegion myRegion 300 keV
/gate/physics/ActivateSpecialCuts e-

# "Geant4 Production cut"
/gate/physics/Electron/SetCutInRegion  myregion 0.1 mm

David




On Tue, Sep 22, 2015 at 7:53 AM, Wonmo Sung <s1moremore at gmail.com> wrote:

> Thanks for your reply.
>
>
> I changed the source code and got slightly different results.
>
>
> By the way, what are the differences between production cut and range cut?
>
> To the best of my knowledge, "range cut" means that particle is not
> produced if the range of produced particles is less than "range cut". However,
> I can't tell differences between "production cut" and "range cut".
>
>
> Anyway, I will try to set this value by a macro..
>
> I appreciate your answers again.
>
>
> Regards,
>
> Wonmo Sung
>
>
> ------------------------------
> *보낸 사람:* david.sarrut at gmail.com <david.sarrut at gmail.com> 대신 David Sarrut <
> David.Sarrut at creatis.insa-lyon.fr>
> *보낸 날짜:* 2015년 9월 21일 월요일 오후 11:29
> *받는 사람:* 성원모
> *참조:* gate-users at lists.opengatecollaboration.org
> *제목:* Re: [Gate-users] To set an energy threshold limit lower than 250 eV
>
> Hello,
>
> exact, the lower limit was hardcoded I dont really know why. You can try
> to set it to 0 or 100 eV in the source code to see what happens. It may
> slow down simulation. Note this is a "production cut" not a "range cut"
> (lower limit for the G4ProductionCutsTable)
>
> Maybe it could be interesting to allow the user to set this value by a
> macro ...
>
> Sincerely,
> David
>
> On Mon, Sep 21, 2015 at 9:52 AM, 성원모 <wsung at snu.ac.kr> wrote:
>
>> Dear gate-users
>>
>>
>> Hello! I'm currently playing with Gate v7.1.
>>
>>
>> I would like to set an energy threshold limit lower than 250 eV (e.g.,
>> 100 eV). However, Gate seems to have minimum energy threshold, 250 eV.
>>
>> I tried to use
>>
>>
>> /gate/physics/Electron/SetCutInRegion
>>
>>
>> to set energy threshold lower than 250 eV, but it was not working.
>>
>> I checked the source code and found limit for production cuts table ("source/physics/src/GatePhysicsList.cc",
>> 80L). But I'm not sure whether I could change it or not.
>>
>> This is strange to me because Geant4.10 Penelope physics has minimum low
>> e- energy down to 100 eV but Gate does not support.
>>
>>
>> Is there any method I can set energy threshold lower than 250 eV?
>>
>> I appreciate any reply in advance.
>>
>>
>> Regards,
>>
>> Wonmo Sung
>>
>> _______________________________________________
>> Gate-users mailing list
>> Gate-users at lists.opengatecollaboration.org
>> http://lists.opengatecollaboration.org/mailman/listinfo/gate-users
>>
>
>
>
> --
> David Sarrut, Phd
> Directeur de recherche CNRS
> CREATIS, UMR CNRS 5220, Inserm U 1044
> Centre de lutte contre le cancer Léon Bérard
> 28 rue Laënnec, 69373 Lyon cedex 08
> Tel : 04 78 78 51 51 / 06 74 72 05 42
> http://www.creatis.insa-lyon.fr/~dsarrut
> _________________________________
>  "2 + 2 = 5,  for extremely large values of 2"
> _________________________________
>
> --
>
> PhD candidate, Radiological Physics Laboratory
> Dept. of Transdisciplinary Studies (Biomedical Radiation Sciences)
> Seoul National University
> Seoul 110-744, KOREA
> Tel: +82 (2) 3668-7371
>
> http://rplab.snu.ac.kr (RPLab accredited by CAMPEP)
>



-- 
David Sarrut, Phd
Directeur de recherche CNRS
CREATIS, UMR CNRS 5220, Inserm U 1044
Centre de lutte contre le cancer Léon Bérard
28 rue Laënnec, 69373 Lyon cedex 08
Tel : 04 78 78 51 51 / 06 74 72 05 42
http://www.creatis.insa-lyon.fr/~dsarrut
_________________________________
 "2 + 2 = 5,  for extremely large values of 2"
_________________________________
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